渤、黄、东海底摩擦系数的研究

STUDY ON BOTTOM FRICTION COEFFICIENT IN THE BOHAI, HUANGHAI AND EAST CHINA SEAS

本文将伴随法用于渤、黄、东海M2分潮的数值模拟,利用Topex／Poseidon高度计资料进行同化,优化海底摩擦系数。文中对底摩擦系数取常数时进行了优化,同时还对底摩擦系数的一种新的处理方法进行了研究,即在计算海区选取一些点给定底摩擦系数,海区中任意一点的底摩擦系数由这些点的底摩擦系数线性播值得到,优化后得到空间分布的底摩擦系数。针对两种不同的线性底摩擦假设分别进行了一系列的实际实验,结果表明由空间分布的底摩擦系数得到的模拟值比底摩擦系数取常数得到的模拟值更接近观测值,能有效地提高数值模拟的精度。

In this study, the adjoint method was used to optimize the bottom friction coefficients（BFC） in the Bohai, Huanghai and East China Sea. The BFC was optimized when it was constant, and a new method was proposed： the BFC of each grid point in the computing area could be expressed in terms of some reduced parameter set through linear interpolation and the reduced parameter set was called the independent BFC. A series of experiments were conducted for two different linear BFC assumptions. The experimental results demonstrated that compared with the constant BFC, the BFC with spatial distribution could produce higher simulation accuracies.